How it works
This multiplication chart 1-70 opens on rows and columns 1 to 20. Arrows under the chart move one block at a time. The 70 row is the 7 row with a 0 added: 70 × 8 = 560.
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4,900 squares and a six way tie
The 4,900 squares hold only 1,484 different answers. Six of them tie for the most squares, 14 each: 120, 180, 240, 360, 420 and 840. The last two get there because 6 × 70 and 12 × 70 add one more pair. Just 41 answers appear once, and 2,485 facts are left when turnarounds count once.
Size 80: a multiplication chart 1-80
Under Chart size, 1 to 80 redraws the grid with 6,400 squares and 1,939 answers. Now 240, 360 and 720 lead with 16 squares each. A mile is 80 chains of 22 yards, so 80 × 22 = 1760 is the yards in a mile.
- Work the 70 row from the 7 row. 7 × 12 = 84, so 70 × 12 = 840, the minutes in 14 hours.
- At size 80, double a number three times and write a 0: 15 goes 30, 60, 120, so 80 × 15 = 1200.
- For any fact, such as 70 × 61, type both numbers under Find a fact and press Go.
Questions and answers
What is special about 70 × 36 = 2520?
2520 is the smallest number that every number from 1 to 10 divides with nothing left over. On this chart it fills 8 squares: 36 × 70, 40 × 63, 42 × 60, 45 × 56 and their turnarounds.
Is there an 80 multiplication chart on this page?
Yes. Under Chart size pick 1 to 80. A multiplication chart 80 rows by 80 columns has 6,400 squares and splits into 16 even blocks of 20 by 20. The 1-70 chart also has 16 blocks, but 7 of them are part blocks.
How do I print all 70 rows?
Press Print all 16 pages. You get 9 full blocks of 20 by 20, 6 half blocks of 20 by 10 and one 10 by 10 corner. Print this part gives the block in view.
How do weeks fit the 70 row?
A week is 7 days, so the 70 row counts days ten weeks at a time: 70 × 3 = 210 days is 30 weeks. 70 × 52 = 3640 is 520 weeks, 10 days short of ten 365 day years.